Word Count : 240

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The polymer trapping model is a mechanism explaining symplastic phloem loading in certain plants, particularly those with minor veins adapted for efficient sugar transport. In this model, sucrose synthesized in mesophyll cells diffuses into specialized companion cells called intermediary cells through plasmodesmata, which are cytoplasmic channels connecting cells. The key feature of the polymer trapping model is the selective retention ______ _________ ________ ___ ________ ______ _____ ___.
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